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    <p>Why are you putting variables in a single list attribute? Why not make them all class attributes so you can access them by name not number? E.g., <code>self.equations_data</code>, <code>self.accuracy</code>, etc?</p> <p>The problem with your nested loop is that it's too nested. You are iterating over <code>i.session_data[7]</code> n-times, where n is evidently 9, the length of session_data. You'd want something like:</p> <pre><code>for i in saved_sessions: for j in range(len(i.session_data)): if j!=7: y=i.session_data[j] # print out your elements here for x in i.session_data[7]: #print out elements </code></pre> <p><strong>BUT DON'T DO THAT.</strong> Revise your approach so that you're not saving attributes in that one list. At least store them in a dictionary so you can access them by name. Better yet, store them as attributes of the class.</p> <p>As for printing out your class, you should implement the <code>__str__(self)</code> method in <code>Session</code> to put the data in the class instance into a string per your desired format, e.g.:</p> <pre><code>class Session(object): ... def __str__(self): out = 'ID:%s\nAMOUNT:%d ... '%(self.ID, self.amount, ...) # And so on. return out </code></pre> <p>That way you can just execute:</p> <pre><code>for session in saved_sessions: print str(session) </code></pre> <p>And that's it. How pretty! (And FYI, it's more Pythonic to use descriptive words for your variable names when looping with <code>for ... in</code>.)</p> <p><strong>Other recommendations</strong></p> <ol> <li>As @David Robinson points out, your class <code>Main</code> won't run as you want it to. You should <a href="http://docs.python.org/tutorial/classes.html" rel="nofollow">read about Python classes</a> before continuing, since you're making some assumptions about them that aren't correct. You must declare methods static with <code>@staticmethod</code> if you want to access them without an instance, and I don't think this is very Pythonic.</li> </ol> <p>2&amp;3. Use <code>re</code> instead of nested <code>if</code> statements, e.g.:</p> <pre><code>if not re.search(r'[\*\-\+\/]', operation): # Invalid operation, you should raise an exception here raise ValueError </code></pre> <p>4 . Review <a href="http://www.python.org/dev/peps/pep-0008/" rel="nofollow">the style guide for Python</a> and format your code appropriately. It will help you start writing more Pythonically, which will make your code clearer and better.</p> <p>Those were things that caught my eye</p>
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    1. POIssue reguarding python objects and nested lists
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    1. CO+1 for storing session data in named attributes in an object, and for writing a \_\_str\_\_ method!
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    2. COTHANK YOU!!! So very grateful for the insight. For some stupid reason i thought putting all my object attributes in a list was somehow making life easier but now i see how stupid that is. And i cant believe i didn't think about the __str__ method, very stupid of me. Anyways i've taken all advice on board here. Very appreciative your advice means alot everyone, thank you.
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